SQL SELECT 语句
SELECT 语句用于从表中选取数据。

结果被存储在一个结果表中（称为结果集）。

SQL SELECT 语法
SELECT 列名称 FROM 表名称
以及：

SELECT * FROM 表名称
注释：SQL 语句对大小写不敏感。SELECT 等效于 select。

SQL SELECT 实例
如需获取名为 “LastName” 和 “FirstName” 的列的内容（从名为 “Persons” 的数据库表），请使用类似这样的 SELECT 语句：

SELECT LastName,FirstName FROM Persons
“Persons” 表:
Id LastName FirstName Address City
1 Adams John Oxford Street London
2 Bush George Fifth Avenue New York
3 Carter Thomas Changan Street Beijing
结果：
LastName FirstName
Adams John
Bush George
Carter Thomas
SQL SELECT * 实例
现在我们希望从 “Persons” 表中选取所有的列。

请使用符号 * 取代列的名称，就像这样：

SELECT * FROM Persons
提示：星号（*）是选取所有列的快捷方式。

结果：
Id LastName FirstName Address City
1 Adams John Oxford Street London
2 Bush George Fifth Avenue New York
3 Carter Thomas Changan Street Beijing
在结果集（result-set）中导航
由 SQL 查询程序获得的结果被存放在一个结果集中。大多数数据库软件系统都允许使用编程函数在结果集中进行导航，比如：Move-To-First-Record、Get-Record-Content、Move-To-Next-Record 等等。

类似这些编程函数不在本教程讲解之列。如需学习通过函数调用访问数据的知识，请访问我们的 ADO 教程 和 PHP 教程。
程
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1 T-SQL中SELECT语法结构
::=
[WITH <common_table_expression> [,…n]]
<query_expression>
[ ORDER BY { order_by_expression | column_position [ ASC | DESC ] }
[ ,…n ] ]
[ ]
[ OPTION ( <query_hint> [ ,…n ] ) ]
<query_expression> ::=
{ <query_specification> | ( <query_expression> ) }
[ { UNION [ ALL ] | EXCEPT | INTERSECT }
<query_specification> | ( <query_expression> ) […n ] ]
<query_specification> ::=
SELECT [ ALL | DISTINCT ]
[TOP ( expression ) [PERCENT] [ WITH TIES ] ]
< select_list >
[ INTO new_table ]
[ FROM { <table_source> } [ ,…n ] ]
[ WHERE <search_condition> ]
[ ]
[ HAVING < search_condition > ]
2 基本SELECT查询
SELECT * FROM [dbo].[Product]
　　使用星号(*)通配符时，将返回全部列，列按照定义表的时候的顺序显示。

3 查询记录中指定字段
　　在不需要数据表中全部字段值时，可以指定需要查询的字段名称，这样不仅显示的结果更清晰，而且能提高查询的效率。

SELECT [ProductID],[ProductName] FROM [dbo].[Product]
4 在查询结果中使用表达式
SELECT
[ProductID],
[ProductName],
[UnitPrice] * 2 AS DoubleUnitPrice
FROM [dbo].[Product]
　　AS关键字表示为表达式指定一个用于显示的字段名称，这里AS为一个可选参数，也可以不使用。

5 显示部分查询结果
　　当数据表中包含大量的数据时，可以通过指定显示记录数限制返回的结果集中的行数。

SELECT TOP [n | PERCENT] FROM table_name
　　TOP后面有两个可选参数，n表示从查询结果集返回指定的n行，PERCENT表示从结果集中返回指定的百分比数目的行。

SELECT TOP (10) * FROM [dbo].[Product]
SELECT TOP (10) PERCENT * FROM [dbo].[Product]
6 带限制条件的查询
　　数据库中如果包含大量的数据，根据特殊要求，可能只须查询表中的指定数据，既对数据进行过滤。在SELECT语句中使用WHERE字句，对数据进行过滤。

SELECT * FROM [dbo].[Product] WHERE [ProductID] <= 10
7 带AND的多条件查询
　　使用SELECT查询时，可以增加查询的限制条件，这样可以使查询的结果更加精确。在WHERE字句中使用AND操作符，限定满足所有查询条件的记录才会被返回。可以使用AND连接两个或多个查询条件。多个条件表达式之间用AND分开。

SELECT * FROM [dbo].[Product]
WHERE [ProductID] <= 10 AND [UnitPrice] >= 20
8 带OR的多条件查询
　　在WHERE声明中使用OR操作符，表示只需要满足其中一个条件的记录即可返回。OR也可以连接两个或多个查询条件，多个条件表达式直接使用OR分开。

SELECT * FROM [dbo].[Product]
WHERE [ProductID] <= 10 OR [UnitPrice] >= 20
9 使用LIKE运算符进行匹配查询
　　在不能明确指定查询的限定条件，可以使用LIKE运算符进行模式匹配查询。在查询时可以使用的通配符：

通配符 说明
% 包含零个或多个字符的任意字符串
_ 任何单个任意字符
[] 指定范围或集合中的单个字符
[^] 不在指定范围或集合中的单个字符
SELECT * FROM [dbo].[Product]
WHERE [ProductName] LIKE ‘%LINQ’
SELECT [ProvinceID]
,[ProvinceCode]
,[ProvinceName]
FROM [dbo].[Province]
WHERE [ProvinceCode] LIKE ‘_10000’

SELECT [ProvinceID]
,[ProvinceCode]
,[ProvinceName]
FROM [dbo].[Province]
WHERE [ProvinceCode] LIKE ‘[1,2]10000’

SELECT [ProvinceID]
,[ProvinceCode]
,[ProvinceName]
FROM [dbo].[Province]
WHERE [ProvinceCode] LIKE ‘[^1,2]10000’

10 使用BETWEEN … AND查询
　　BETWEEN … AND运算符可以对查询值限定一个查询区间。

SELECT * FROM [dbo].[Product]
WHERE [ProductID] BETWEEN 10 AND 20
　　等价于：

SELECT * FROM [dbo].[Product]
WHERE [ProductID] >= 10 AND [ProductID] <= 20
11 对查询结果进行排序
　　ORDER BY子句可以根据指定的字段的值对查询的结果进行排序，并可以指定排序方式（升序/降序）。

SELECT * FROM [dbo].[Product]
ORDER BY [UnitPrice] DESC
　　ORDER BY子句可以对查询结果进行升序排列，升序排列是默认的排序方式，在使用ORDER BY 子句升序排列时，可以使用ASC关键字，也可以省略该关键字。

12 使用GROUP BY聚合数据
SELECT [CategoryID], SUM([Quantity]) FROM [dbo].[Product] GROUP BY [CategoryID]

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